<li>
  <img src="{{$user->gravatar()}}" alt="{{$user->name}}" class="gravatar"/>
  <a href="{{route('users.show',$user->id)}}" class="username">{{$user->name}}</a>
    @can('destroy', $user)
  <form action="{{ route('users.destroy', $user->id) }}" method="post">
       {{ csrf_field() }}
       {{ method_field('DELETE') }}
       <button type="submit" class="btn btn-sm btn-danger delete-btn">删除</button>
     </form>
      @endcan
</li>
